Lining up two boxes next to each other with CSS

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Ok, I modified it so the two float boxes are inside another box. So I now have it working In IE7 and Opera 9.21. It is NOT working in Firefox 2.0.0.4.

Most of my audience will most likly be using IE 7 (Maybe 6 on some). However there will be enough using Firefox that I need it to look correct in there as well.

I have attached a picture of how it looks in IE and Firefox. The Green Box is the box that the two floats should be in. THe two floats are in a black box, the red box is the cost which should come right below the two floats and the Blue is the Courses box